abnormal mucosa in esophaguserythematous mucosa in esophagusgastric mucosa in esophagusectopic gastric mucosa in esophagussalmon colored mucosa in esophagusoesophagus mucosamucosal lining of esophagusbarrett's mucosaoesophagus barretts mucosanormal esophageal mucosaesophageal squamous mucosadistal esophageal mucosa